Slack-adjuster.



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I. JGNES.

SLACK ADJUSTEH.

APPLlcA'rloN rum Nov. 2a, 191:.

Patented Apr. 1. 1913.

Mya

UNITED STATES tmirantil OFFICE.

Isaac JoNEs, vor oHEYENNE, WYOMING.

sLAoK-ADJUSTEP..

of the United States. residiugat Cheyenne,

in the county of Laramie and State of l-Yvonnng. have invented 'certainnew and usetul Improvements in Slack-Ad]usters;A and 'I do herebydeclare. the following to be a full, zleanaiul exact descriptu'in-of theinvention, such as lwill enable 'others skilled in t-liepart to which1tappe'rtalns to make and use the same.

This invention relates to slack adjusters such as are employed incombination with moved to the right in the' drawing.

l through the port l. `the piston 2 and the lend 5 ot the cylinder, 1S

'Huid pressure brakes to -compensate forthe slack producedthewcaring'down of the. brake shoes. v i

The object. o'l" the invention is to'provide such a device of strongdurable.'construction-4 all of whose parts'are positiyely actuated toproduce adir-ertoverstroke of the push rod to fully apply the brakes..

ln its broad aspectsr` the invention contemplates the provision of meansfor autoi' brake cylinder,v the. exact. location of which is immaterialto the. invention. lrefelablyr however. it is applied to the under side,of the car body in the usual ina-nner. 'A piston 2 carrying the usualVl-"estiughouse' piston sleeve 2 is :nrtuatcd by admitting and'exhausting the fluid medium to the, cylinder l'nterposcd between" theusual release .spring t5.

'l`elescoping in the piston sleeve. 3 is the p'ushrod 7 carrying at itsouterfeud a guide block S which is adapted to abut the end of the brakelever t) when vthe push rod is The end of the brake lever tl islongitudinally movable in the block 5 and a brake chain rod v10 islinked to the'said end of' the brake lever t) by u'ieans of coimec'tionsl1`- 12, 13v that thabim lever can be actuated rndeligient ot' the. pushrod connect-lons.

Specication of Letters Patent.

'positions of the rollers.

.fications ca n be made in lthe constructi Patent-ed Afp'rn, 1913.

Alipucatioa med Nvfember 25, 1912. serial no. 733,358.

The parts so. farv as described form-,the usual construction ofA brakingmechanism.

Carried by Athe pi'stonsleeve` 3 'are suitable lugs 25 to which thelinks 14 oa setof tog; gies 1.4, Y1 5 are printed.' The coperatin links15 arepivoted tothe push rod block preferably at the bint-s marked 16.-',.-The

lcooperating link s o each toggle .are pivoted -toge'thersuch-asindicated at 17. v Y

" vSecured'px-.eferabl'y to atransveifse of the car body is a bracket19' embracingjtho carsill and rigidly connected to 'saidlbradket rollers21. The strap is provided.W-1th,-,aA

series of holes 22,' in any two .of Wihihth pint-les, 23 of vthe rollers21 can be placed,.-

thereby providing means .for adjusting .the The toggle links 15arprovided roller enga ing cam surfaees245 preferably shaped as s own inthe drawing'.

The operation of the apparatus `1s as fol- Vl'o\vs':.l/Yhen a new brakeshoe is installed,

thelrfollers 2 1 are' adjusted so that when Athe brakes are fullyapplied.y the toggle links'15 wlll just come into engagement- `Withdthetained therefore `Within the normal stroke ofthe piston sleeve 3 and thepush rod .'1 which latter obviously moves the same is a strap 20carrying the vtoggle'eng-agi'ng rollers, The full brakingr action 'canbe o5'- an'iount as the piston under ordinary conditions.v lWhen thebrake shoes -\vear, however. the stroke of the piston will be -insu f.

ficientto fully apply the brakes. Due: to thefact that vthe piston andpush rod must travel va greaterv distance than Wasnecessary whenjthebrake shoes were newly ad .justeL thetoggle-links 15 vvill be forced'longitudiinilly between the rollers 21 which act o'n the cam surfaces24 of said links 'to make. or straighten t-he'toggles 14,- 15,

thereby forcing the push rod outwardly an:

auxiliary amount. The said push rod will As the bra-ke shoes wearthepush rod' .Will

`therefore travel farther t-han the piston-fv always be actuated anamount commensurate. with such wear so that 'the brakesmayl at all timesbe fully applied irrespective of the size of the brakeshoes A simplemechanism is therefore 'provided which is actuated in a positive mannerto' fully oompensate for the slack produced by the 'diminution irnthesize ofthe brake shoes'.

lt is obv'ious that manyl changes and m disclosed herein ,Withoutdeparting from the spirit or sbope of the invention as defined in theappended claims. l

What I claim is:- 1

1. In a fluid pressure brake apparatus, thel combination with the brakecylinder, piston rod and telescopic push rod, of to gle leversinterposed between said piston ro and push rod, and stationary means-to'engage said toggles to straighten 'the saine, thereby lengthening thestroke of said jpush rod.

2. In a fluid pressure brake apparatus, the lcombination witlrthe brakecylinder, piston rod and 'push rod, of connections between said pistonrod and push rod and stationary means to engagesaid connections duringthe movement ofjthe piston rod' to move said push rod-an. auxiliaryvamount. l

3. In artluid pressure brake apparatus, the combination with the' brakecylinder, piston rod and `telescopic push rod, of toggle leversinterposed between'said piston' rod and push rod, androllers adapted to`engage said togpler `levers to straightenthe same,` thereby engtheningthe strokeof said -push rod.

i 4. In a Huid pressure brake apparatus, the combination with the brakecylinder, pistonl rod and telescopic push rod, ofconnections betweensaid piston rod and-push rod, and rollers toeneage said connectionsduring the movement of the piston to move said push rod an auxiliaryamount. Y I

5. Ina. fluid pressure brake apparatus, the-.combination with the brakecylinder,

piston rod and telescopic push rod, of. connections interposed betweensaid piston rod and push rod, said-conneotionsbeing nor` mally idle forpredetermined strokes of the piston, and means adapted to 'act on saidconnections to move said push rod farther than the piston when thestrokesof the pisstraighten the toggle and move the p ush rod anauxiliary amount when the'stroke of vthe piston exoeeds a. predeterminedamount.

`7. In a slack adjusting mechanism for fiuid pressure brakes,`thecombination with a cylinder, piston rod and push rod, of pivoted leversinterposed lbetween said piston rod and push rod, and means operativewhen the brake .shoe wears land the movement of the piston exceeds. thenormal brake applying stroke to actirate said levers 'to vmove the pushrod an auxiliary amount and lthereby thoroughly apply the brakes.

In testimony whereof I afiix my signature, in presence of ytwowitnesses.

` ISAAC JONES. Witnesses:

JOHN D. CLARK, i BERTHA MA'rHsoN.

